"Artifacts," by Scott G. Ortman

Table 34. Cross-tabulation of Raw Material Grade vs. Number of Grinding Surfaces for Two-Hand Manos, Castle Rock Pueblo
Raw Material Grade
Number of Grinding Surfaces Total
 One Surface Two Adjacent Surfaces Two Opposite Surfaces Three Surfaces Four Surfaces
Dakota quartzite count
grade
surfaces

1
20.0
6.3

2
40.0
13.3

2
40.0
40.0

5
100.0
9.8

Fine-grained sandstone count
grade
surfaces

1
20.0
6.3

1
20.0
11.1

2
40.0
13.3

1
20.0
16.7

5
100.0
9.8

Medium-grained sandstone

count
grade
surfaces

6
21.4
37.5

5
17.9
55.6

10
35.7
66.7

3
10.7
60.0

4
14.3
66.7

28
100.0
54.9

Conglomerate sandstone

count
grade
surfaces

8
61.5
50.0

3
23.1
33.3

1
7.7
6.7

1
7.7
16.7

13
100.0
25.5

  TOTAL

count
grade
surfaces

16
31.4
100.0

9
17.6
100.0

15
29.4
100.0

5
9.8
100.0

6
11.8
100.0

51
100.0
100.0

NOTES: Grade = percent within grade; surfaces = percent within number of surfaces.

Chi-Square Test Results

Value df 2-Tailed Significance
Pearson chi-square 16.675a 12 0.162
Likelihood ratio 17.965 12 0.117
No. of valid cases 51

a Eighteen cells (90.0%) have an expected count of less than five. The minimum expected count is .49.
df = degrees of freedom.
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